Cameras like the Lytro are great because they let you snap photos and then adjust the depth-of-field and focus after the photo's already been taken. It does this by collecting all of the focus data it needs at the time the photo is taken, which is great, but Lytro cameras are close to $400. If you already have an SLR… »12/17/12 4:00am 12/17/12 4:00am